How to select MCS on AP 8030DN

Created 7 days agoLatest reply Dec 12, 2018 10:48:42 197 4 0 0
  Rewarded E coins: 32768 (problem resolved)
First of all, thank you in advance for your help!

I am trying to select different MCS modulations on AP 8030DN, for 802.11n. The truth of the matter is that I can't find that command in the AP. I am trying to limit the data rate per STA, but I think that is simply a QoS bandwidth limitation, not an MCS limit.

I know with 802.11ac, the standard forbids choosing the MCS (the options are only 0-7, 0-8 or 0-9). Is there a way that I can configure the MCS for 802.11n, or at least check the value currently in use for a certain packet/STA (besides using monitoring using extra hardware)? 

Thank you!

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  • convention:  Adept   Created 2 days 10:48 Helpful(0) Helpful(0)

802.11n MCS Guide

MCS (Modulation and Coding Scheme)

The configuration of the 802.11n radio frequency rate is implemented by the MCS index value. The MCS modulation coding table is a representation proposed by 802.11n to characterize the communication rate of the WLAN. The MCS takes the factors affecting the communication rate as the columns of the table, and uses the MCS index as a row to form a rate table.

Therefore, each MCS index actually corresponds to the physical transmission rate under a set of parameters. Tables 1-4 and 1-5 list MCS rate tables with a bandwidth of 20 MHz and a bandwidth of 40 MHz, respectively.

(For a description of the full rate, see the 20.6 Parameters for HT MCSs section of the document 802.11n-2009.)

From the table below, it can be concluded that MCS 0-7 uses a single spatial stream, and when MCS=7, the rate value is the largest. MCS 8~15 uses two spatial streams. When MCS=15, the rate value is the largest.

MCS is divided into two categories: basic MCS sets, and supports MCS sets.

l Basic MCS set: The basic MCS is the MCS rate set that the AP must support. The client must meet the basic MCS rate configured by the AP to be associated with the AP.

l Supporting the MCS set: Supporting the MCS rate set is based on the basic MCS set of the AP. The AP can support a higher rate set. The user can configure the MCS rate set to allow the client to select the basic MCS. A high rate is associated with the AP.

It should be noted that when the MCS index value is configured, the input MCS index value indicates a range, that is, 0 to the configuration value. For example, if 5 is input, it indicates that the set MCS value is 0 to 5.162331492141137162332070114706

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rociot  Novice   Created 7 days ago Helpful(0) Helpful(0)

Hi dear, pls review this link: ... 125882?section=j008, in 5.5 80211ac supported-mcs. Maybe you can find some information about your issue.
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paulobfsilva     Created 6 days ago Helpful(0) Helpful(0)

Hi rociot, thank you for your help!
In fact, 5.5 shows this AP only allows choosing the maximum MCS allowed, either 7, 8 or 9 (being that MCS 0-7 is a mandatory feature of 802.11ac standard). My problem is how to choose MCS using 802.11n, which should be a feature included in the AP's firmware, but I suspect it doesn't exist... Any way of doing this?
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Mysterious.color  Novice   Created 5 days ago Helpful(0) Helpful(0)

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find what you love and let it kill you.


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